2133A 2155A and 2168A SL-B System Board Locations

2133A 2155A and 2168A SL-B System Board


J1 Keyboard
J2 Mouse
J3 Serial Port (Comm A)
J4 Serial Port (Comm B)
J5 Parallel Port
J6 Display
J7 Diskette
J8 Power
J9 Hard Disk Drive Local Bus IDE
J11 Riser Card-ISA AT BUS only
J12 J13 Cache Jumpers
J14 VESA Video feature connector
Click here > Video Feature PIN-layout
J15 Video Disable (normal 1-2)
J16 J17 Cache Jumpers

SIMM sockets can be populated in any order
J18 RAM 72-Pin Memory SIMM Bank-3
J20 RAM 72-Pin Memory SIMM Bank-2
J21 RAM 72-Pin Memory SIMM Bank-1
J22 RAM 72-Pin Memory SIMM Bank-0
J24 J25 Processor Jumpers
J31 Processor Jumper
J26 LED Conn. Power 1-2 / HD 3-4
J27 Speaker Volume Control (WT only)
J29 Power Supply 2-Pin (on/off SW)
J30 Power Supply 3-Pin Connector
J37 Speed Control (On 25 MHz/Off 33 MHz)
J38 Fan (optional)
J50 Parity (Parity 1-2/Non Parity 2-3)
J51 Cache Jumpers
U3 System BIOS
U38 Cache Memory Tag Socket (128KB/256KB)
U48 Video Memory ZIF socket
U56 486SX Processor
U57 Video Controller

Cache banks 1 & 2 must both be filled for
256KB cache memory. For 128KB, fill Bank 1 only.
U78,U75 Cache Memory Socket Bank 1
U70,U69 Cache Memory Socket Bank 1
U77,U74 Cache Memory Socket Bank 2
U68,U67 Cache Memory Socket Bank 2

Type B-1 Processor Jumper Settings

Processor J25 J31 J24
486SX 2-3 1-2 2-3
486DX 486DX2 1-2 2-3 2-3
487SX 486ODP 1-2 2-3 1-2

Cache Memory Modules
128-KB cache
Bank-1 4x 28-Pin modules 32 KB x 8/25 ns
Tag-RAM 1x 28-Pin module 8 KB x 8/20 ns

256-KB cache
Bank-1 4x 28-Pin modules 32 KB x 8/25 ns
Bank-2 4x 28-Pin modules 32 KB x 8/25 ns
Tag-RAM 1x 28-Pin module 32 KB x 8/20 ns

Cache Memory Jumper Settings

Cache MB J51 J17 J12 J13 J16
0-KB ?? 1-2 2-3 1-2 2-3 1-2
128-KB 1-2 1-2 2-3 1-2 2-3
256-KB 2-3 2-3 1-2 2-3 1-2


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